Door framework for open hearth furnaces or other industrial furnaces



Sept 15, 1964 K G. REINING ETAL 3,148,666

DOOR FRAMEWORK FOR OPEN HEARTH FURNACES OR OTHER INDUSTRIAL FURNACES Original Filed Oct. 17, 1955 INvENTos,

GusTAv REICHE, HELMUT PAUL arm GusrAv REIN/N6, KARL eusTAv Psw/Na, Dect-Aseo,

B Y HHMl/ PAUL 07727 6057A V PHN/N6, EXEU TOR United States Patent 3,148,666 DOOR FRAMEWORK FOR OPEN HEARTH FUR- NACES OR OTHER INDUSTRIAL FURNACES Karl Gustav Reining, deceased, late of Mulheim (Ruhr),

Germany, by Helmut Paul Otto Gustav Reining, executor, Graf Wyrichstrasse 9, Mulheinl (Ruhr), Germany; and Helmut Paul Otto Gustav Raining and Gustav Reiche, Mulheim (Ruhr), Germany (both Messrs. Cushman, Darby, and Cushman, American Security Bldg., 730 th St. NW., Washington 5, D.C.) Original application Oct. 17, 1955, Ser. No. 541,101, now Patent No. 2,960,078, dated Nov. 15, 1960. Divided and this application Nov. 15, 1960, Ser. No. 71,865 3 Claims. (Cl. 122-497) This application is a division of our copending application, Serial No. 541,101, iiled October 17, 1955, now Patent No. 2,960,078.

The invention relates to door framework with cooling means for open hearth furnaces and other industrial furnaces, and more particularly to such door frames provided with a projection at the side facing the furnace, the projection forming a support, horizontal or incl-ined, for the ceiling of the furnace made out of refractory brickwork.

In order to guarantee the stability of the door frames of open hearth furnaces or the like in spite of the high temperature of the interior of the furnace, hollow door frames are provided. A cooling uid such as water is recirculated through the frames and through a recooling arrangement connected therewith. Nowadays, the door frame is used for the production of steam. For this purpose the door frame is connected by means of forward and return pipes with a vessel mounted above the level of the ceiling of the furnace, so that the mixture of hot water and steam, produced in the door frame, is lifted into the vessel, Where steam and Water separate. Then the Water reilows through the return pipe into the frame. This system has proved especially advantageous in the production of high pressure steam.

In case of frames, designed for the production of steam, considerable diiculties arose in connection with the cooling of the projection extending into the interior of the furnace and by which the ceiling of the furnace is supported.

It is an essential object of the invention to provide an improved door frame suitable for open hearth furnaces and the like and which ensures a perfect cooling of the side facing of the door frame and especially of the parts of the frames supporting the ceiling. A further object of the invention is to provide for an improved design of door frames for open hearth furnaces and the like, permitting the production of high pressure steam.

Further objects of the invention may be seen from the following specification.

Briefly stated, the invention mainly consists in the following:

It was found out that the previous defects and deiiciencies of the known frames for the production of steam have been due to the fact that the water recirculating into the frames did not uniformly flood the parts extending into the interior of the furnace. Therefore it is possible that (along some parts of the frame) zones of higher temperatures are formed. The cooling water entering these zones is vaporised and a flowing layer of steam is formed, which causes a heavy wear in the inside of the cooling frame. In principle, the invention provides means to distribute the Water recirculating into the frame in such way over the total surface of the projection of the frame extending into the interior of the furnace, that the water flows uniformly along the inside of the horizontal or slightly inclined wall of the projection. Thereby, various l ice separate flows of steam in the frame are prevented, and a regular cooling of the most heated parts of the frame extending into the interior of the furnace is effected.

With the above and other objects of the invention in view we will now describe a preferred embodiment of our invention.

In the drawings'- FIGURE 1 is an elevation view of a furnace door according to this invention;

FIGURE 2 is a section view taken along line 2--2 in FIGURE 1;

FIGURE 2a is a fragmentary View of part of FIGURE 2; and

FIGURE 3 is a section View taken along line 3-3 in FIGURE 1.

Referring now to the drawing, there is shown a furnace door frame 10 consisting of two opposed legs 12, 14 joined together at their upper ends yby a horizontal member 16. These three parts may be built separately and detachably connected to each other by any suitable means such as bolts. Each part 12, 16, 14 carries adjacent the upper end a steam dome 18, 20, 22, respectively, having outlet pipes 24, 26, and 28, respectively. Likewise, a water pipe 30 is connected to the horizontal member 16, while legs 12 and 14 each carry a water pipe 32. These steam pipes and water pipes are connected with the vessel (not shown) for separating steam and water. The horizontal member 16 of the door frame 10 is provided with a projection .34 operative to extend into the interior of the furnace and for supporting the furnace ceiling.

Within the interior of the horizontal member 16, spaced apart partition walls 36 are provided for connection to the bottom 38 of the horizontal member 16 and to the opposed side walls thereof thereby forming vertical channels. Each such channel receives a downwardly extending water pipe 40 which pipe branches off from a manifold line 42, in turn, joined to the inlet pipe 30. The lower ends of the pipe 40 are provided with slotted or expanded skirts 44 extending substantially along the entire channel width between adjacent dividing walls 36. Carried within the horizontal projection 34 is a guide sheet 46 spaced apart from the interior surface of the horizontal member 16, and bent to conform. with the inner configuration thereof and extending along the whole length of the projection 34, thereby leaving a narrow channel 4S along the inner wall of the projection 34. As seen in FIGURE 2a the guide sheet 46 extends through a hole 49 in each partition wall 36. Water escaping from the skirts 44 flows along the inner wall of the horizontal member 16 forming a relatively thin layer, the water flowing upwardly through the channel 48 and out of steam dome 20. The cooling water is thereby distributed evenly over the entire projection 34 of the horizontal member 16, which portion of the door frame receives the major portion of the furnace heat.

Reference is now made to FIGURE 3 which shows, generally in section, the construction of the furnace legs. The water pipe 32 becomes substantially enlarged at the lower portion 50 of the leg 14, taking the shape of an enlarged longitudinal chamber 52. 'Ihe chamber 52 is spaced within the interior of the lower portion 50 of the leg 14 forming narrow channels 56 therebetween. Water, flowing downwardly through pipe 32 and out of the opening 54 then flows upwardly through the channels 56, receiving heat from the furnace and carrying the heated fluid away through the steam dome 22. The upper end of the chamber 52 is provided with a skirted or slotted pipe 58 similar in construction to the pipe 40 so that part of the water flows directly against the inclined surface 60 at the top of the lower portion 50 of the leg 14, Ithis surface 60 being generally coextensive with the 3 upper wall of the projection 34 of the horizontal member 16.

From the foregoing description of the preferred embodiment of this invention, it is evident that the objects of this invention, together with many practical advantages are successfully achieved. While the preferred embodiment of our invention has been described, numerous further modifications may be made without departing from the scope of this invention.

Therefore, it is to be understood that all matters herein set forth or shown in the accompanying drawings are to be interpreted in an illustrative and not in a limiting sense.

We claim:

1. Door frame for furnaces comprising: a generally U-shaped body including two hollow legs and a hollow horizontal member connecting said legs, said horizontal member having opposed top and bottom walls and opposed sidewalls and a projecting portion at the lower end thereof for reception into a furnace interior; guide sheet means carried within said horizontal =`nember adjacent said projecting portion and said bottom wall to provide a narrow channel therebetween; spaced apart generally vertical partitions joined to the bottom wall and opposed side walls of said horizontal member and terminating short of the top wall thereof, defining thereby a plurality of vertical channels communicating with a common fluid collecting space adjacent said top wall; means for separately introducing cooling liquid into each of said channels, said means being positioned to discharge liquid adjacent a side wall of said horizontal member opposite said projecting portion, whereby liquid flows across the bottom wall and upwardly through said narrow 4 channel for collecting heat from the furnace interior; and means communicating with said collecting space for withdrawing heated iluid therefrom.

2. Door frame dened in claim 1 wherein said liquid introducing means includes pipes extending downwardly into each of said vertical channels, said pipes having a lower end of slotted construction adjacent said bottom wall for introducing the liquid substantially across each vertical channel between adjacent partition walls.

3. Door frame defined in claim l wherein said legs include an enlarged lower portion having a wall portion generally co-extensive with said projecting portion; means providing an enlarged chamber in said lower portion, said chamber having an upper liquid inlet opening and a lower discharge opening, and spaced inwardly from the interior leg surface to dene a narrow channel therebetween, whereby cooling liquid flows downwardly through said chamber thence upwardly through said latter narrow channel; means for withdrawing heated liquid therefrom and means connected to said chamber for directing cooling liquid onto said co-extensive wall portion.

References Cited in the le of this patent UNITED STATES PATENTS 1,168,647 Knox Jan. 18, 1916 1,191,519 Knox July 18, 1916 1,391,197 Law Sept. 20, 1921 1,529,193 Lewis Mar. 10, 1925 1,836,784 Williams Dec. 15, 1931 2,503,895 Wilson Apr. ll, 1950 2,552,142 Braun May 8, 1951 

1. DOOR FRAME FOR FURNACES COMPRISING: A GENERALLY U-SHAPED BODY INCLUDING TWO HOLLOW LEGS AND A HOLLOW HORIZONTAL MEMBER CONNECTING SAID LEGS, SAID HORIZONTAL MEMBER HAVING OPPOSED TOP AND BOTTOM WALLS AND OPPOSED SIDEWALLS AND A PROJECTING PORTION AT THE LOWER END THEREOF FOR RECEPTION INTO A FURNACE INTERIOR; GUIDE SHEET MEANS CARRIED WITHIN SAID HORIZONTAL MEMBER ADJACENT SAID PROJECTING PORTION AND SAID BOTTOM WALL TO PROVIDE A NARROW CHANNEL THEREBETWEEN; SPACED APART GENERALLY VERTICAL PARTITIONS JOINED TO THE BOTTOM WALL AND OPPOSED SIDE WALLS OF SAID HORIZONTAL MEMBER AND TERMINATING SHORT OF THE TOP WALL THEREOF, DEFINING THEREBY A PLURALITY OF VERTICAL CHANNELS COMMUNICATING WITH A COMMON FLUID COLLECTING SPACE ADJACENT SAID TOP WALL; MEANS FOR SEPARATELY INTRODUCING COOLING LIQUID INTO EACH OF SAID CHANNELS, SAID MEANS BEING POSITIONED TO DISCHARGE LIQUID ADJACENT A SIDE WALL OF SAID HORIZONTAL MEMBER OPPOSITE SAID PROJECTING PORTION, WHEREBY LIQUID FLOWS ACROSS THE BOTTOM WALL AND UPWARDLY THROUGH SAID NARROW CHANNEL FOR COLLECTING HEAT FROM THE FURNACE INTERIOR; AND MEANS COMMUNICATING WITH SAID COLLECTING SPACE FOR WITHDRAWING HEATED FLUID THEREFROM. 